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1/*
2 * include/linux/nfsd/const.h
3 *
4 * Various constants related to NFS.
5 *
6 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
7 */
8
9#ifndef _LINUX_NFSD_CONST_H
10#define _LINUX_NFSD_CONST_H
11
12#include <linux/nfs.h>
13#include <linux/nfs2.h>
14#include <linux/nfs3.h>
15#include <linux/nfs4.h>
16
17/*
18 * Maximum protocol version supported by knfsd
19 */
20#define NFSSVC_MAXVERS 3
21
22/*
23 * Maximum blocksizes supported by daemon under various circumstances.
24 */
25#define NFSSVC_MAXBLKSIZE RPCSVC_MAXPAYLOAD
26/* NFSv2 is limited by the protocol specification, see RFC 1094 */
27#define NFSSVC_MAXBLKSIZE_V2 (8*1024)
28
29#ifdef __KERNEL__
30
31#include <linux/sunrpc/msg_prot.h>
32
33#ifndef NFS_SUPER_MAGIC
34# define NFS_SUPER_MAGIC 0x6969
35#endif
36
37/*
38 * Largest number of bytes we need to allocate for an NFS
39 * call or reply. Used to control buffer sizes. We use
40 * the length of v3 WRITE, READDIR and READDIR replies
41 * which are an RPC header, up to 26 XDR units of reply
42 * data, and some page data.
43 *
44 * Note that accuracy here doesn't matter too much as the
45 * size is rounded up to a page size when allocating space.
46 */
47#define NFSD_BUFSIZE ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
48
49#ifdef CONFIG_NFSD_V4
50# define NFSSVC_XDRSIZE NFS4_SVC_XDRSIZE
51#elif defined(CONFIG_NFSD_V3)
52# define NFSSVC_XDRSIZE NFS3_SVC_XDRSIZE
53#else
54# define NFSSVC_XDRSIZE NFS2_SVC_XDRSIZE
55#endif
56
57#endif /* __KERNEL__ */
58
59#endif /* _LINUX_NFSD_CONST_H */